<html>

<head>
  <meta content="text/html; charset=UTF-8" http-equiv="content-type"/>
  <title>小黑记事本</title>
  <meta content="text/html; charset=UTF-8" http-equiv="content-type"/>
  <meta content="noindex, nofollow" name="robots"/>
  <meta content="noindex, nofollow" name="googlebot"/>
  <meta content="width=device-width, initial-scale=1" name="viewport"/>
  <link href="../css/index_小黑记事本.css" rel="stylesheet" type="text/css"/>
</head>

<body>
  <!-- 主体区域 -->
  <section id="todoapp">
    <!-- 输入框 -->
    <header class="header">
      <h1>小黑记事本</h1>
      <input @keyup.enter="add" autocomplete="off" autofocus="autofocus" class="new-todo" placeholder="请输入任务"
             v-model="inputValue"/>
    </header>
    <!-- 列表区域 -->
    <section class="main">
      <ul class="todo-list">
        <li class="todo" v-for="(item, index) in list">
          <div class="view">
            <span class="index">{{index + 1}}</span>
            <label>{{item}}</label>
            <button @click="remove(index)" class="destroy"></button>
          </div>
        </li>
      </ul>
    </section>
    <!-- 统计和清空 -->
    <footer class="footer" v-show="list.length!==0">
      <span class="todo-count" v-if="list.length!==0">
        <strong v-text="list.length"></strong> items left
      </span>
      <button @click="clear" class="clear-completed" v-show="list.length!==0">
        Clear
      </button>
    </footer>
  </section>
  <!-- 底部 -->
  <footer class="info">
    <p>
      <a href="http://www.itheima.com/"><img alt="" src="./img/black.png"/></a>
    </p>
  </footer>
  <!-- 开发环境版本，包含了有帮助的命令行警告 -->
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script>
    var app = new Vue({
      el: "#todoapp",
      data: {
        list: ['吃饭饭', '睡觉觉', '写代码'],
        inputValue: '好好学习, 天天向上'
      },
      methods: {
        add() {
          //
          this.list.push(this.inputValue);
          // 清空
          this.inputValue = '';
        },
        clear() {
          this.list = [];
        },
        remove(index) {
          /**
           * splice(start, [deleteCount])
           * start:
           *    指定修改的开始位置
           * deleteCount: 可选
           *    整数, 表示要移除的数组元素的个数
           */
          this.list.splice(index, 1);
        }
      }
    })
  </script>
</body>

</html>
